Is Donald Trump going mad? It depends how you define the word. But since he’s hoping to be elected US president on Tuesday, it would be handy to know. Democrats describe him as “weird” and “unhinged”. His rival, Kamala Harris, raised the “M” question again last week. “This is someone who is “unstable, obsessed with revenge, consumed with grievance, and out for unchecked power,” she warned.

Harris, to her credit, was being relatively polite, though goodness knows why, given the way he disses and demeans her. So let’s pose the question in more colloquial, idiomatic terms. Has stark raving Trump finally lost his marbles? Are there bats in the belfry? If he’s off his rocker, not playing with a full deck and away with the fairies, the world and the voters have a right to know.

Harris’s assessment is obviously not an objective medical diagnosis of mental disorder. It’s a normal person’s reaction to the abnormal things Trump says and does. Crazy-strange campaign speeches by him and his supporters, notably at Madison Square Garden last weekend – a gathering akin to a Nazi Nuremberg rally – are reviving the debate about his sanity that began during his first term.

In The Dangerous Case of Donald Trump, published in 2017, a group of 27 psychiatrists, psychologists, and other mental health professionals raised numerous red flags. One contributor suggested he was clearly off his chump: “Trump is now the most powerful head of state in the world, and one of the most impulsive, arrogant, ignorant, disorganised, chaotic, nihilistic, self-contradictory, self-important, and self-serving.”

That professional opinion, made........

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